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Author Topic: stihl 028 wb  (Read 8106 times)

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Offline mountaineer

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stihl 028 wb
« on: March 03, 2008, 08:30:04 pm »
 i lost one of my av mount bolts today and ripped the rubber mount that goes from the carb to the piston. gonna get a new one soon but was wondering whats the easiest way to put it back on. seems by looking it could be tricky. i am assuming carb side first then try to get it on the other side and tighten the clamp. anyone got any suggestions on how to go about it.  thx
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Offline joe_indi

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Re: stihl 028 wb
« Reply #1 on: March 04, 2008, 04:30:08 am »
If you do not want to separate the tank housing from the crankcase to replace the manifold, this is the alternate way to do it:
Remove all the AV mounting screws.This will help you get some more room to work.
Before you do anything else check the impulse hose since it too could get damaged from a loose AV mounting.
Fit the manifold onto the cylinder and tighten the clamp.
Then fit the carb end of the manifold.
Refit the AV mounting screws and carb.
Joe
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Re: stihl 028 wb
« Reply #2 on: March 04, 2008, 09:18:25 am »
thx i was thinking the carb side first but i havent done this before so i will try crankcase side first. looks a little tricky either way. now im waiting on the part. i went to the local stihl dealer and they said the manifold would be 24$ and labor would be 55$ an hour with about an hour time to do the job. for 79$ i could easily buy a parts saw and have a lot of extra parts. it seemed a little high in price. what do you all think? thx for the info
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Offline sawguy21

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Re: stihl 028 wb
« Reply #3 on: March 04, 2008, 09:54:08 am »
The price sounds about right for that job. If you try it, be patient so you don't have to do it a second time.
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Offline mike_van

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Re: stihl 028 wb
« Reply #4 on: March 04, 2008, 01:25:54 pm »
Take the carb. right off, there's a little metal ring inside the rubber neck - Take that ring out, then wad up the rubber neck up & push it through towards the head. Reverse the steps to put the new one in.
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Offline mountaineer

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Re: stihl 028 wb
« Reply #5 on: March 05, 2008, 06:00:53 pm »
just put it together. not bad at all. i put the crankcase side on first. it was easier to fish the other end through the carb hole. i put it all back together and when it runs it hesitates some. it also bogs when i give it full throttle. need to adjust the carb?  thx for all the help folks.
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Offline Kevin

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Re: stihl 028 wb
« Reply #6 on: March 05, 2008, 07:43:41 pm »
High and Low speed jets are one turn out from a lightly seated position.

Adjust the idle speed just below clutch engagement.

Adjust the low speed to obtain highest idle then turn it counterclockwise 1/8 turn.

Adjust the high speed to obtain highest rpm under load.

Adjustments to be made with a clean air filter and a warm engine.

You should be using a tachometer.
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Re: stihl 028 wb
« Reply #7 on: March 06, 2008, 07:02:15 pm »
i had put a newer air filter on the saw when i worked on it. i thought that might be the problem. sure enough i switched it back and she purrs once again. i don't know whats wrong with the new filter. oh well.   ;D
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Re: stihl 028 wb
« Reply #8 on: March 06, 2008, 07:26:41 pm »
i bought a not in the greatest shape 028 av super and took the part off of it. i tried to crank it a few times and it did not start.(before i took the part off)the lady i bought it from had no idea if it ran so it might be salvageable. is checking the compression the best way to see if its worth fixing? and if so what kind of compression tester should i get?  thx
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Offline joe_indi

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Re: stihl 028 wb
« Reply #9 on: March 07, 2008, 08:44:53 am »
Quote
it also bogs when i give it full throttle.

This is a frequent problem on some Stihl saws (028, 038, MS380, MS381)that have the choke shutter in the air filter instead of in the carb.
This type of choke is held back by a spring.If the spring is weak or loose, when the engine is revved up, the higher air flow causes the shutter to go into the 'close' position.
In the worst cases it remains closed until the engine dies from flooding.
Usually it closes at full revs, opens as soon as the revs come down, and keeps doing this as long as you have the throttle fully pressed.
If you didn't know, the symptoms would make you suspect the ignition system.
The cure is simple.Either tighten the spring a bit or use the spring from your old filter, since it seems to work fine.

Joe
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Re: stihl 028 wb
« Reply #10 on: April 05, 2008, 08:37:39 am »
so i finally got my 028 av super i ordered off of ebay.(no problems there the guy that sold it to me is super nice) but one thing it is doing is when i throttle it it hesitates. i have to work the throttle  up and down a bit to get it to rev. once i get it going it runs well. it does seem to bog a little more than my wb i have. to test it i used the bar and chain off my wb to get a true idea of how it runs. the chain is sharp. any ideas on what might be the issue?  thx andy
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Offline Kevin

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Re: stihl 028 wb
« Reply #11 on: April 05, 2008, 06:04:36 pm »
I would adjust the carb first,then tear it down and clean it if need be.
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Re: stihl 028 wb
« Reply #12 on: April 05, 2008, 06:18:46 pm »
kevin do you mean adjust like the instructions you gave earlier in this post? i have never adjusted a carb and i am a bit tentative because i would hate to make matters worse. i've heard you  can ruin a saw by not having the right settings on the carb. but the settings it has now might be bad so...
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Offline Kevin

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Re: stihl 028 wb
« Reply #13 on: April 05, 2008, 06:44:56 pm »
I like using a tach, it's your call.  ;D
You can get someone to tune it but you should learn if you are so inclined.
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Re: stihl 028 wb
« Reply #14 on: April 05, 2008, 06:47:21 pm »
i would really like to learn. where would i get a tach?
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Offline Kevin

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Re: stihl 028 wb
« Reply #15 on: April 05, 2008, 06:54:38 pm »
I know Bailey's have them ...

http://www.baileysonline.com/search.asp?skw=tachometer&PageNo=1&x=18&y=6

http://www.forestryforum.com/board/index.php/topic,8047.0.html

I have the Stihl DET-303 but I don't think they make that one any longer.
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Offline leweee

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Re: stihl 028 wb
« Reply #16 on: April 05, 2008, 07:12:46 pm »
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Re: stihl 028 wb
« Reply #17 on: April 05, 2008, 07:57:21 pm »
that is really good info leweee. thx. do you know what the high rpm is for the 028 av super? 
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Offline leweee

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Re: stihl 028 wb
« Reply #18 on: April 05, 2008, 11:46:05 pm »
Shop Manual says 13,000 rpm. maximum  with bar & chain tensioned. ;D
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Re: stihl 028 wb
« Reply #19 on: April 06, 2008, 08:52:43 am »
should i tach and adjust it with the bar and chain on or off?   oh by the way leweee, don't let the !@#$%^'s get you down.   i like the saying. gonna remember it.   thx andy
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